Onebigoutlet 100" Manual Screen Pull Down Projector Projection, Home Theater Movie 80"x60", 4:3 HD Dual wall and ceiling installation design Ideal for home theater, public display, business, classroom etc High contrast 1.3 gain screens optimizes picture quality Shelf-lock system allows you to adjust the height and aspect ratio Diagonal 100 offers 80"60 viewing area; 4:3 screen format